Corrosion and Passivation of Tin Anode in Na2CO3 Solutions and the Effect of Halide Ions

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Title:Corrosion and Passivation of Tin Anode in Na2CO3 Solutions and the Effect of Halide Ions
Creators:
Abd El-Rehim, Sayed S.
Taha, Fouad
Saleh, Mohamed B.
Mohamed, Said A.
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 58, 9, pp. 2013-2020

Abstract

The corrosion and passivation of tin anode in Na<sub>2</sub>CO<sub>3</sub> (0.01 to 1.0 M) was investigated using potentiodynamic and cyclic voltammetry techniques and complemented by X-ray and scanning electron microscopy. The polarization curves exhibit two anodic peaks assigned to the electroformation of Sn(II) and Sn(IV) species, respectively, prior to permanent pssive region. The anodic dissolution reactions are controlled by diffusion. X-Ray diffraction showed that the permanent passive layer is duplex and consists of SnO and SnO<sub>2</sub>. A multiplicity of cathodic peaks is related to the electroconduction of the anodically formed compounds. Addition of Cl<sup>-</sup>, Br<sup>-</sup> or I<sup>-</sup> ions into the carbonate solutions enhances the anodic dissolution of tin to some extent depending upon the sodium carbonate concentration. In the passive region, addition of the halide ions causes pitting of the halide ions causes pitting corrosion at a critical pitting potential. The pitting potential decreases with increasing both the halide ion concentration and the scanning rate but increases with increasing the sodium carbonate concentration. SEM examination confirms the occurance of pitting corrosion.

Title:Corrosion and Passivation of Tin Anode in Na2CO3 Solutions and the Effect of Halide Ions
Creators:
Abd El-Rehim, Sayed S.
Taha, Fouad
Saleh, Mohamed B.
Mohamed, Said A.
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:58
Number:9
Page Range:pp. 2013-2020
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19932013UNSPECIFIED
ID Code:324
Item Type:Article
Deposited On:06 Feb 2009 17:00
Last Modified:06 Feb 2009 16:00

Citation

Abd El-Rehim, Sayed S.; Taha, Fouad; Saleh, Mohamed B.; Mohamed, Said A. (1993) Corrosion and Passivation of Tin Anode in Na2CO3 Solutions and the Effect of Halide Ions. Collection of Czechoslovak Chemical Communications, 58 (9). pp. 2013-2020. ISSN 0010-0765

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